Question

An atom has atomic number 92 and mass number 238. Which of these is an isotope

of this atom?
a.235U
92
b.238Th
91
c.92Nb
41
d.92X
235

Answer 1

a. U235

Step-by-step explanation:

Atomic number 92 is that of Uranium. It naturally occurs in several isotopes:

U-238, U-235, U-234